Maybe I’ve just watched too many cartoons, but I find it a little hard to maintain my immersion (?) while watching the show when new characters are introduced and they’re very clearly voiced by Azula, The Green Lantern, Lex Luthor, and Optimus Prime.
It’s not so much Cullen or Brown, it’s that they’re clearly doing their Optimus and Luthor voices. I’ve seen Clancy in a gazillion different things, both animated and live action, and he’s 100% using his Lex voice here.